Reactive dyes

ABSTRACT

A water-soluble reactive dye of the formula: 
     
         D.sup.1 --Z.sup.1 --NR.sup.1 --T--NR.sup.2 --Z.sup.2 --D.sup.2 (1) 
    
     wherein 
     each of D 1  and D 2 , independently, represents the radical of a water-soluble chromophoric compound, 
     each of Z 1  and Z 2 , independently, represents a triazine or pyrimidine residue carrying an atom or group imparting fibre-reactivity to the dye, 
     R 1  represents an optionally substituted alkyl radical, 
     R 2  represents hydrogen or an optionally substituted alkyl radical, and 
     T represents a 1,3- or 1,4-phenylene radical which may carry one or more substituents selected from halogen, alkyl, alkoxy, acylamino, nitro and carboxy.

This application is a division of Ser. No. 07/472,407, filed Feb. 1, 1990, now U.S. Pat. No. 5,059,681, which is a continuation of Ser. No. 07/084,097, filed Aug. 11, 1987 now abandoned.

This invention relates to reactive dyes, to their preparation and to their application to textile substrates.

According to the invention, there are provided water-soluble reactive dyes of the formula:

    D.sup.1 --Z.sup.1 --NR.sup.1 --T--NR.sup.2 --Z.sup.2 --D.sup.2( 1)

wherein

each of D¹ and D², independently, represents the radical of a water-soluble chromophoric compound,

each of Z¹ and Z², independently, represents a triazine or pyrimidine residue carrying an atom or group imparting fibre-reactivity to the dye,

R¹ represents an optionally substituted alkyl radical,

R² represents hydrogen or an optionally substituted alkyl radical, and

T represents a 1,3- or 1,4-phenylene radical which may carry one or more substituents selected from halogen, alkyl, alkoxy, acylamino, nitro and carboxy.

The radicals represented by D¹ and D², which may be the same or different, are radicals of water-soluble organic dyes. Typical radicals represented by D¹ and D² respectively are of the form D³ NR³ -- and D⁴ NR⁴ -- being derived from water-soluble dyes D³ NR³ H and D⁴ NR⁴ H wherein each of R³ and R⁴, independently, represents hydrogen or an optionally substituted alkyl radical and each of D³ and D⁴, independently, represents a radical of the azo for example monoazo, disazo and metallised azo, anthraquinone, phthalocyanine, formazan or triphenodioxazine series, carrying one or more water-solubilising groups, for example sulphonic acid groups.

It is preferred that each of D¹ and D² represents a sulphonated monoazo radical, for example a radical of the formula: ##STR1## wherein A represents a radical of the benzene or naphthalene series and one of U and V is --SO₃ H, the other being H. Particularly useful dyes are obtained when A is a sulphonated phenyl or naphthyl radical, especially a radical containing a sulpho group in ortho position to the azo link. Thus, valuable structures represented by A include: ##STR2##

Each of the triazine or pyrimidine residues represented by Z¹ and Z² carries a substituent which makes the dyes of the invention fibre-reactive, that is to say capable of reacting, under suitable conditions, with the hydroxyl groups present in cellulosic fibres or with the amino groups present in natural and synthetic polyamide fibres to form a covalent linkage between the dye and the fibrous substrate. Substituents capable of imparting the required fibre-reactivity are well known in the art.

Thus, Z¹ and Z² may represent triazine radicals of the formula: ##STR3## wherein X represents Cl, Br, F, SO₃ H or a quaternary ammonium group. Other radicals which may be represented by Z¹ and Z² include fluorochloropyrimidine and methanesulphonylchloropyrimidine radicals. Preferably, both of Z¹ and Z² are monochlorotriazine radicals.

Optionally substituted alkyl radicals which may be represented by R¹, R², R³ and R⁴ include C₁₋₈, preferably C₁₋₄, alkyl radicals which may carry substituents selected from halogen, hydroxy, cyano, carboxy, carbamoyl, alkoxy, acyl, acyloxy, alkoxycarbonyl and optionally substituted phenyl.

Those dyes of the invention in which Z¹ and Z² carry labile chlorine, bromine or fluorine atoms may be prepared by reacting a 1,3- or 1,4-phenylene diamine of the formula: ##STR4## wherein R¹ and R² are as defined above and the aromatic ring may be substituted by halogen, alkyl, alkoxy, acylamino, nitro or carboxy, with one mole of a triazine or pyrimidine compound of the formula:

    D.sup.1 --Z.sup.1 --X.sup.1                                ( 5)

and one mole of a triazine or pyrimidine compound of the formula:

    D.sup.2 --Z.sup.2 --X.sup.2                                ( 6)

wherein D¹ and D² are as defined above; Z¹ and Z² are as defined above but carrying only Cl, Br or F atoms and each of X¹ and X² is Cl, Br or F.

This process can conveniently be carried out by stirring the reactants in an aqueous medium, optionally in the presence of a water-soluble organic solvent, at a temperature of from 20°-60° C., and preferably maintaining the pH at from 5-8 by adding an acid-binding agent to neutralise the hydrogen halide formed during the reaction. Suitable acid-binding agents are alkali metal hydroxides, carbonates and bicarbonates.

As examples of diamines of Formula (4) there may be mentioned the N-methyl, N-ethyl, N-benzyl, N,N'-dimethyl and N,N'-diethyl derivatives of 1,3- and 1,4-phenylene diamines.

Compounds of Formula (5) and Formula (6) may be obtained, for example, by reacting cyanuric chloride or an appropriate pyrimidine at 0°-20° C. in an aqueous medium, with water soluble dyestuff compounds of the formulae D¹ H and D² H, especially D³ NR³ H and D⁴ NR⁴ H which are defined above. Such dyestuff compounds have been fully described in the prior art and especially include monoazo dyes of the formula: ##STR5## wherein A, U and V are as defined above.

Dyes of the invention in which Z¹ and Z² carry labile chlorine, bromine or fluorine atoms may also be prepared by reacting a diamine of Formula (4) with two moles of cyanuric halide or an appropriate pyrimidine followed by the dyestuff compounds D¹ H and D² H.

Dyes of the invention containing residues of Formula (3) in which X is a sulpho or quaternary ammonium group may be obtained by reacting dyes in which X is Cl, Br or F with an alkali metal hydrogen sulphite or an appropriate tertiary amine or pyridine compound. Such a reaction is normally carried out in aqueous medium at 30° to 100° C.

The reactions leading to the formation of the dyes of the invention may be performed using conditions that have been fully described in the prior art for such reactions. Similarly, the dyes may be isolated by known methods, for example spray drying or precipitation and filtration. As in the case of other dyes containing sulphonic acid groups, it is often convenient to isolate and use the dyes in the form of their water-soluble salts, particularly their alkali metal (especially sodium) or ammonium salts. It is to be understood that the invention relates to both the free acids and their salts.

The dyes of the present invention may be used for colouring a wide range of textile materials containing hydroxyl or amino groups, for example wool, silk, synthetic polyamides and natural or regenerated cellulose, for example cotton or viscose rayon materials, by conventional methods used for colouring such materials with water-soluble reactive dyes. Thus, in the case of cellulose they are preferably applied in conjunction with a treatment with an acid binding agent such as caustic soda, sodium carbonate, phosphate, silicate or bicarbonate, which may be applied to the cellulose textile materials before, during or after the application of the dyestuff.

The dyes of the present invention are valuable reactive dyes for cellulose. They yield coloured textiles with good resistance to washing and light. They are particularly characterised by having superior wash-off properties relative to the corresponding known dyes in which both of R¹ and R² are hydrogen. Furthermore, the dyes of the invention possess superior fixation efficiency compared with the dyes of GB 2065159A which contains a 1,2-phenylene radical in place of the 1,3- or 1,4-phenylene radicals represented by T in Formula (1) above.

A particularly useful dye of the invention has the formula: ##STR6##

The dyes of the invention may be used in admixture with other reactive dyes. Attractive royal blue shades can be obtained by using the dye of Formula (8) in admixture with the dye of the formula: ##STR7## the weight ratio of the dye of Formula (9) to the dye of Formula (8) being in the range 80:20 to 98:2. The dye of Formula (9) is described in our GB 1450746.

The invention is illustrated but not limited by the following Examples in which all parts and percentages are by weight.

EXAMPLE 1

A solution of 1-hydroxy-2-(o-sulphophenylazo)-8-(3',5'-dichloro-s-triazinylamino)-naphthalene-3,6-disulphonic acid (49.25 parts, 72% strength) and N-methyl-p-phenylene diamine (3.52 parts) in water (800 parts) was stirred at 20° C. and pH 6.5 for 16 hours. Salt (80 parts) was added with stirring and the resultant precipitated dye was collected and dried. Yield 58.6 parts (61% strength). The product gives a red shade when applied to cellulosic fibers.

EXAMPLE 2

A solution of 1-hydroxy-2-(1',5'-disulphonaphth-2'-ylazo)-8-(3",5"-dichloro-s-triazinylamino)naphthalene-3,6-disulphonic acid (80.7 parts, 47% strength) and N-methyl-p-phenylene diamine (3.1 parts) in water (650 parts) was stirred at pH 6.5 and 20° C. for 2 hours. Acetone (3000 parts) was added slowly with stirring and the paste solid collected. Yield 61.3 parts (47% strength).

The following Table gives further Examples of dyes of the invention, the dyes being identified in accordance with the notation of Formula (1).

    __________________________________________________________________________     Example                                                                             D.sup.1 H     Z.sup.1    R.sup.1                                                                           T      R.sup.2                                                                          D.sup.2                                                                          Z.sup.2                            __________________________________________________________________________     3    3-ureido-4-(3',6',8'-trisulpho-                                                              2-chlorotriazin-4,6-diyl                                                                  CH.sub.3                                                                          p-phenylene                                                                           H D.sup.1                                                                          Z.sup.1                                 naphth-2'-ylazo)aniline                                                   4    1-hydroxy-2-(1',5'-disulpho-                                                                 "          "  "      " " "                                       naphth-2'-ylazo)-6-methyl-                                                     aminonaphthalene-3-                                                            sulphonic acid                                                            5    1-hydroxy-2-(1'-5'-disulpho-                                                                 "          "  "      " " "                                       naphth-2'ylazo)-6-amino-                                                       naphthalene-3-sulphonic                                                        acid                                                                      __________________________________________________________________________

EXAMPLE 6

N,N'-Dimethyl-p-phenylenediamine (5.22 parts) in water (50 parts) was added to a stirred solution of 1-hydroxy-2-(2'-sulphophenylazo)-8-(3",5"-dichloro-s-triazinylamino)naphthalene-3,6-disulphonic acid (62.25 parts, 50% strength) in water (700 parts) at pH 6.5 and 20° C. After 30 minutes, salt (105 parts) was added, with stirring, and the resultant precipitated dye was collected and dried.

Yield 51.3 parts (59% strength).

EXAMPLE 7

A mixture of 1-hydroxy-2-(2'-sulpho-4'-methoxyphenylazo)-6-(2",4"-dichloro-s-triazinylamino)naphthalene-3-sulphonic acid (31.5 parts, 32% strength) and N-methyl-p-phenylenediamine dihydrochloride (1.82 parts) in water (1000 parts) was stirred at 30° to 35° C. and pH 6.5 for 20 hours. Methylated spirits (74 OP, 500 parts) was added with stirring and the resulting precipitate was collected and dried.

Yield 15.3 parts, 72% strength.

EXAMPLE 8

A solution of 1-hydroxy-2-(2'-sulphophenylazo-8-(2",4"-dichloro-s-triazinylamino)naphthalene-3,5-disulphonic acid (29.8 parts, 44% strength) and N-methyl-p-phenylenediamine (1.22 parts) in water (1000 parts) was stirred at 20° C. and pH 6.5 for 1 hour. Sodium chloride (150 parts) and potassium chloride (50 parts) were added and the resulting precipitate was collected and dried.

Yield 22 parts, 61% strength.

EXAMPLE 9

A solution of 1-hydroxy-2-(2'-methyl-4'-sulphophenylazo)-8-(2",4"-dichlorotriazinylamino)naphthalene-3,6-disulphonic acid (26.56 parts at 100% strength) and N-methyl-p-phenylenediamine dihydrochloride (3.64 parts) in water (800 parts) was stirred at pH 6.5 and 35° C. for 2 hours. On cooling to 20° C., salt (200 parts) was added and the precipitated solid was collected and dried.

Yield 36.0 parts, 52% strength.

EXAMPLE 10

N-methyl-p-phenylenediamine dihydrochloride (2.32 parts) was added at 10° to 15° C. and pH 6.5 to a stirred solution of 1-hydroxy-2-(2'-sulpho-4'-methylphenylazo)-8-(2",4"-dichlorotriazinylamino)naphthalene-3,6-disulphonic acid (26.73 parts at 61% strength) in water (450 parts). After 10 minutes, salt (30 parts) was added, precipitated product was collected and dried.

Yield 23.7 parts at 70% strength.

    __________________________________________________________________________     Example                                                                             D.sup.1 H         Z.sup.1    R.sup.1  T      R.sup.2                                                                           D.sup.2                                                                          Z.sup.2                 __________________________________________________________________________     11   2-Amino-3-sulpho-4-(3'-amino-                                                                    2-chlorotriazin-4,6-diyl                                                                  CH.sub.3 1,4-phenylene                                                                         H  D.sup.1                                                                          Z.sup.1                      4'-sulphophenylamino)-                                                         anthraquinone                                                             12   2-(3',6',8'-trisulphonaphth-2-yl-                                                                "          "        "      CH.sub.3                                                                          " "                            azo)-4-methoxy-5-amino-                                                        acetanilide                                                               13   1-Hydroxy-2-(2'-sulpho-                                                                          "          "        1,3-phenylene                                                                         H  " "                            phenylazo)-6-aminonaphthalene-                                                 3-sulphonic acid                                                          14   1-Amino-2-(2',5'-disulphophenyl-                                                                 "          "        "      "  " "                            azo)-7-(2"-sulpho-5"-aminophenyl-                                              azo)-8-hydroxynaphthalene-3,6-di-                                              sulphonic acid                                                            15   1-(4'-sulphophenyl-3-carboxy-                                                                    "          HOC.sub.2 H.sub.4                                                                       1,4-phenylene                                                                         "  " "                            4-(2"-sulpho-5"-aminophenyl-                                                   azo)pyrazol-5-one                                                         16   4-Nitro-4'-(4"-methyl-                                                                           "          C.sub.2 H.sub.5                                                                         "      "  " "                            aminophenylazo)stilbene-                                                       2,2'-disulphonic acid                                                     17   1-Ethyl-2-hydroxy-3-carbonamido-                                                                 "          CH.sub.3 1,3-phenylene                                                                         "  " "                            4-methyl-5-(2',4'-disulpho-                                                    6'-aminophenylazo)pyrid-6-one                                             18   2,4,6-Trihydroxy-5-(2',5'-                                                                       "          "        1,4-phenylene                                                                         "  " "                            disulpho-4'-aminophenyl-                                                       azo)pyrimidine                                                            19   2-(2',4'-diamino-5'-                                                                             "          "        "      CH.sub.3                                                                          " "                            sulphophenylazo)naphthalene-                                                   4,6,8-trisulphonic acid                                                   20   1:1-Copper complex of 1-hydroxy-2-                                                               "          3-sulphobenzyl                                                                          "      H  " "                            (1'-hydroxy-4',8'-di-                                                          sulphonaphth-2-ylazo)-8-amino-                                                 naphthalene-3,6-disulphonic acid                                          21   1:2-Chromium complex of 1-                                                                       5-chloro-6-fluoro                                                                         CH.sub.3 "      "  " "                            hydroxy-2-(2'-hydroxy-5-'                                                                        pyrimidin-2,4-diyl                                           nitrophenylazo)-8-                                                             aminonaphthalene-                                                              3,6-di-sulphonic acid                                                     22   1-Hydroxy-2-(2',5'-disulpho-                                                                     2-chlorotriazin-4,6-diyl                                                                  3-hydroxypropyl                                                                         "      "  " "                            phenylazo)-7-amino-naphthalene-3-                                              sulphonic acid.                                                           __________________________________________________________________________      ,

EXAMPLE 23

A dyeing vessel was filled with water (liquor ratio 20:1) at 30° C. and salt (80 g/l) was added. The machine was run for 15 minutes to allow the salt to dissolve and dye [a 95/5 mixture of the dyes of Formula (9) and Formula (8)] was added as a concentrated solution over 5 minutes to give a concentration of 5% on the weight of fabric. After allowing 10 minutes for the dye to distribute evenly, the temperature was raised to 85° C. over 20 minutes. After running for a further 20 minutes, soda ash (20 g/l) was added as a slurry over 10 minutes and fixation was allowed to proceed for 60 minutes.

After discharging the dye liquor, the fabric was rinsed thoroughly and soaped at the boil for 20 minutes. The fabric was rinsed and dried to give a uniform level dyeing with good fastness properties. 

We claim:
 1. A reactive dye mixture containing from 2 to 20% by weight of a reactive dye having the following formula: ##STR8## and from 98 to 80% by weight of the dye of the formula: ##STR9##
 2. A reactive dye mixture containing dyes of Formulae (A) and (B) in a weight-to-weight ratio of 80:20 to 98:2, wherein said dye of Formula (A) is: ##STR10## and said dye of Formula (B) is: ##STR11##
 3. A process for colouring textile materials which comprises applying thereto a reactive dye mixture defined in claim
 2. 4. A process according to claim 3 wherein the dye is applied to a cellulosic textile material in conjunction with an acid binding agent.
 5. A process for colouring textile materials which comprises applying thereto a reactive dye as claimed in any one of claims 1 to
 4. 6. A process according to claim 5 wherein the dye is applied to a cellulosic textile material in conjunction with an acid binding agent. u 